Current Electricity questions
395 published questions with worked solutions.
- In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the...
- Fuse wire is a wire of
- When three identical bulbs of 60 watt, 200 volt rating are connected in series to a 200 volt supply, the power drawn by them will...
- The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then:-
- In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in USA. If the resistance of a 60W bulb for...
- A battery is charged at a potential of 15V for 8 hours when the current flowing is 10A. The battery on discharge supplies a...
- A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The...
- Two cells, having the same e.m.f., are connected in series through an external resistance R. Cell have internal resistances r_1...
- Kirchhoff's first and second laws for electrical circuits are consequences of:-
- Three resistances P, Q, R each of 2 and an unknown resistance S form the four arms of a Wheatstone bridge circuit. When a...
- The resistance of an ammeter is 13 and its scale is graduated for a current upto 100 Amps. After an additional shunt has been...
- A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively
- An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20^ C ? The...
- A student measures the terminal potential difference (V) of a cell (of emf and internal resistance r) as a function of the...
- Consider the following two statements. (A) Kirchhoff's junction law follows from the conservation of charge (B) Kirchhoff's loop...
- A current of 2 A flows through a 2 resistor when connected across a battery. The same battery supplies a current of 0.5 A when...
- If voltage across a bulb rated 220 Volt -100 Watt drops by 2.5 % of its rated value, the percentage of the rated value by which...
- The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 is -
- The resistances of the four arms P, Q, R and S in a Wheatstone's bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The...
- Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per...
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